Lycoming IO-390


The Lycoming IO-390 engine is a horizontally opposed, four-cylinder aircraft engine, manufactured by Lycoming Engines.
There is no carburetted version of the engine, which would have been designated O-390 and therefore the base model is the IO-390.
WWW Official Site

Design and development

The engine was originally conceived in the 1970s as the IO-400-X, but the project was never pursued.
The IO-390 family of engines, which Lycoming refers to as the IO-390-X, produce to. The IO-390 was developed from the similar IO-360 engine, to increase the O-360's cylinder bore.
It features a tuned induction system, roller tappets and Slick Start ignition. The engine has a fuel injection system which meters fuel in proportion to the induction airflow with fuel vaporization taking place at the intake ports. The engine has a displacement of. The cylinders have air-cooled heads.
The IO-390 was first introduced at AirVenture 2002. It has a factory recommended TBO of 2000 hours and requires a dynafocal engine mount.
The IO-390 was initially marketed through Lycoming's custom engine subsidiary, Thunderbolt Engines, prior to the engine's certification and was at that time only available for installation on non-certified aircraft. The IO-390 was certified on 30 March 2009 to FAR 33.
In January 2009 the base price of the IO-390-EXP version was USD$32,650.00.
In November 2009 Lycoming announced that it had obtained an FAA Supplemental Type Certificate to replace the originally fitted Lycoming O-360 engines in the Mooney M20E, M20F and M20J with a new or remanufactured IO-390-A3A6 engine. Also on November 12, 2009 Commander Aircraft received an STC for its model 112B using the MTV-12-B/188-59b propeller.

Variants

IO-390 models

;IO-390-X
;IO-390-EXP
;IO-390-A1A6
;IO-390-A1B6
;IO-390-A3A6
;IO-390-A3B6
;IO-390-C1A6
;IO-390-C1B6
;IO-390-C3A6
;IO-390-C3B6

AEIO-390 models

;AEIO-390-A1A6
;AEIO-390-A1B6
;AEIO-390-A3A6
;AEIO-390-A3B6

Applications

;Amateur-built aircraft
;Certified aircraft
;Military Aircraft